Permanent magnet motor rotor lamination structure for improving structural strength and NVH and motor

Abstract

The utility model discloses permanent magnet motor rotor lamination structure and motor of structural strength and NVH improvement, one is, is equipped with two protrusions on first V type magnetic steel groove, is equipped with a protrusion on second V type magnetic steel groove, and the position, angle and size of protrusion are optimized design, two are, all are equipped with the magnetic steel spacing of different shape and different angle offset on double V magnetic steel groove, three are, in first V type magnetic steel groove is provided with the intermediate unequal width magnetic bridge of arc edge, three common reach the purpose of optimizing first V type magnetic steel groove shape, effectively improved the distribution situation of rotor magnetic field and the strength stress of rotor lamination, improved the mechanical property of motor high -speed operation, benefit motor high -speed. The different shape of auxiliary groove is set up on the rotor outer circle, V type and W type, improve the air gap magnetic field waveform, reduce motor harmonic, reduce the radial order electromagnetic force of motor, reduce the noise of motor, so that motor has excellent NVH performance.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a permanent magnet motor rotor lamination structure and motor that improves structural strength and NVH. Background Technology

[0002] In existing technology, a case of an embedded double-V topology structure has been proposed. This structure improves the motor's NVH (noise, vibration, and harshness) by rationally setting the position, size, and distance of the arc-shaped grooves on the rotor core and the position, diameter, and size of the cut-off circular holes, and by combining these two methods. Its structure is as follows: Figure 1 As shown.

[0003] The above case has multiple arc-shaped grooves on the outer edge of the rotor core, and two pairs of axially symmetrical cut-out circular holes are set in the area between the included angle of the double V-shaped inner and outer magnet grooves and the outer edge of the rotor. This combination design can improve the NVH noise of the motor.

[0004] However, the multiple circular holes on its q-axis magnetic circuit and the multiple grooves on its outer edge affect the magnetic circuit, increase the equivalent air gap, which will affect the motor's power performance and increase the manufacturing difficulty of the lamination die. Furthermore, this case did not effectively optimize the magnet slots, which is detrimental to the rotor's structural strength and the motor's high-speed capability. Utility Model Content

[0005] To address the aforementioned deficiencies in existing technologies, a permanent magnet motor rotor lamination structure and motor with improved structural strength and NVH are provided. This effectively improves the distribution of the rotor magnetic field and the strength stress of the rotor laminations, thereby improving the mechanical performance of the motor during high-speed operation and facilitating high-speed motor operation.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] A permanent magnet motor rotor lamination structure that improves structural strength and NVH includes a rotor lamination body, on which 2p magnetic poles are provided and a central shaft hole is formed.

[0008] A first V-shaped magnetic steel groove symmetrical about the d-axis is provided on the magnetic pole. The first V-shaped magnetic steel groove on one side includes an inner edge line and an outer edge line of the magnetic steel groove that are parallel to each other, a first magnetic isolation bridge edge line near the outer circle of the rotor, an arc edge near the other first magnetic steel groove on one side, and a magnetic barrier edge line connecting the arc edge and the inner edge line of the magnetic steel groove. It also includes an upper limit position, a lower limit position, a lower protrusion, and an upper protrusion. The upper limit position is connected between the inner edge line of the magnetic steel groove and the first magnetic isolation bridge edge line, and the lower limit position is connected between the inner edge line of the magnetic steel groove and the magnetic barrier edge line. The upper protrusion is connected between the outer edge line of the magnetic steel groove and the first magnetic isolation bridge edge line, and the lower protrusion is connected between the outer edge line of the magnetic steel groove and the arc edge. The two ends of the magnetic barrier edge line are connected to the arc edge and the lower limit position, respectively.

[0009] According to the above technical solution, the diameter φ1 of the rotor lamination is 140mm~150mm, the diameter of the shaft hole φ2 is 40mm~52mm, and the included angle α1 between the two single-sided first V-shaped magnet slots is 110°~120°; the minimum distance H2 between the two magnets in the first V-shaped magnet slot is 3.0mm~4.0mm, and the gap between the magnet and the magnet slot is 0.05mm~0.1mm to ensure that the magnet can be smoothly inserted into the magnet slot; the two single-sided first V-shaped magnet slots are connected by arc edges to form a magnetic isolation bridge of unequal width, and the minimum width of the unequal width magnetic isolation bridge is H4.

[0010] According to the above technical solution, the first magnetic isolation bridge edge and the outer circle of the rotor are connected by a first equal-width magnetic isolation bridge, with a spacing H1 of 0.7mm to 1.0mm between them; the upper limits are the first edge and the second edge, with the first edge perpendicular to the inner edge of the magnetic slot and a length L1 of 1.0mm to 1.2mm, and the included angle α6 between the second edge and the first edge being 75° to 85°, with the second edge connected to the end of the first magnetic isolation bridge edge; the lower limits are the third edge and the fourth edge, which are perpendicular to each other, with the third edge perpendicular to the inner edge of the magnetic slot and a length L1 of 1.0mm to 1.2mm, and the fourth edge having a length W... 1. The diameter is 1.0mm to 1.4mm; the magnetic barrier edge is divided into a fifth edge and a sixth edge. The angle α2 between the fifth edge and the inner edge of the magnet is 15° to 20°. The fifth edge is located on the side of the inner edge of the magnet groove. The angle α3 between the sixth edge and the inner edge of the magnet groove is 15° to 20°. The maximum distance L2 between the endpoint of the sixth edge and the inner edge of the magnet groove is 4.0mm to 5.0mm. The center of the arc edge is located on the q-axis. The distance H3 between the center and the edge of the shaft hole is 35mm to 40mm. The diameter φ3 of the arc edge is 40mm to 45mm. The minimum width of the unequal-width magnetic bridge is H4. P is the number of pole pairs of the motor; the lower protrusion includes the seventh side, the distance W2 between the starting position of the seventh side and the lower short side of the magnet is 3.5mm to 4.5mm, and the angle α4 between the seventh side and the outer edge of the magnet slot is 145° to 155°; the upper protrusion includes the eighth side, the distance W3 between the starting position of the eighth side and the upper short side of the magnet is 0.5mm to 1.0mm, and the angle α5 between the eighth side and the outer edge of the magnet slot is 160° to 170°.

[0011] According to the above technical solution, it also includes a second V-shaped magnetic steel groove that is symmetrical about the d-axis. The second V-shaped magnetic steel groove includes an inner side line of the magnetic steel groove, a first limit, a second magnetic isolation bridge side line, an outer side line of the magnetic steel groove, a first protrusion, a third magnetic isolation bridge side line, and a second limit that are connected to each other in sequence.

[0012] According to the above technical solution, the included angle β1 between the two single-sided second V-shaped magnetic steel slots is 145°~160°; the minimum distance h2 between the two magnets in the second V-shaped magnetic steel slot is 2.0mm~2.5mm, and the gap between the magnet and the magnetic steel slot is 0.05mm~0.1mm, ensuring that the magnet can be smoothly inserted into the magnetic steel slot; the second equal-width magnetic bridge is formed between the second magnetic isolation bridge edges of the two single-sided second V-shaped magnetic steel slots, and the width h3 of the second equal-width magnetic isolation bridge is 0.8mm~1.2mm; the third equal-width magnetic bridge is formed between the third magnetic isolation bridge edge and the outer circle of the rotor, and the width h1 of the third equal-width magnetic isolation bridge is 0.7mm~1.0mm; the first limit includes a first line segment and a second line segment. The first line segment is perpendicular to the inner side of the magnet groove, and the length l1 of the first line segment is 0.8mm to 1.2mm. The included angle β2 between the first line segment and the second line segment is 75° to 85°. The second limit includes a third line segment and a fourth line segment. The third line segment is perpendicular to the inner side of the magnet groove, and the length l1 of the third line segment is 0.8mm to 1.2mm. The included angle β3 between the third line segment and the fourth line segment is 95° to 105°. The starting position of the first protrusion is 2.5mm to 3.5mm away from the short side of the magnet. The first protrusion is composed of two continuous chamfers r3 and r4, with chamfer r3 being 0.8mm to 1.0mm and chamfer r4 being 0.8mm to 1.0mm.

[0013] According to the above technical solution, two first auxiliary slots are provided in the magnetic poles, which are symmetrically arranged about the d-axis. The first auxiliary slots have a V-shaped structure and are located on the outer circle of the rotor between the first V-shaped magnet and the second V-shaped magnet.

[0014] According to the above technical solution, two second auxiliary slots are provided in the magnetic poles, which are symmetrically arranged about the d-axis. The second auxiliary slots have a W-shaped structure and are located on the outer circle of the rotor between the first V-shaped magnet slot and the q-axis.

[0015] According to the above technical solution, the rotor laminations also have the same number of rivet holes and large-area weight-reduction holes as the number of poles of the motor.

[0016] According to the above technical solution, a keyway and a marking groove with an offset angle are opened in the rotor shaft hole.

[0017] Secondly, an electric motor employs a permanent magnet motor rotor lamination structure that improves structural strength and NVH as described above.

[0018] This utility model has the following beneficial effects:

[0019] 1. First, two protrusions are provided on the outer edge of the first V-shaped magnet slot, and the position, angle, and size of the protrusions are optimized. Second, magnet limiters of different shapes and angles are provided at both ends of the inner edge of the magnet slot. Third, a magnetic isolation bridge with a rounded edge and unequal width is set between the two magnet slots. These three features work together to optimize the shape of the first V-shaped magnet slot, effectively improving the distribution of the rotor magnetic field and the strength stress of the rotor laminations, thus improving the mechanical performance of the motor during high-speed operation and facilitating high-speed motor operation.

[0020] 2. On the second V-shaped magnet slot, firstly, a protrusion is provided on the outer edge of the second V-shaped magnet slot, and the position, angle, and size of the protrusion are optimized; secondly, magnet limiters of different shapes and angles are provided at both ends of the inner edge of the magnet slot. In conjunction with the shape of the first V-shaped magnet slot, this further improves the distribution of the rotor magnetic field and the strength stress of the rotor laminations, improving the mechanical performance of the motor during high-speed operation and facilitating high-speed motor operation.

[0021] 3. Auxiliary slots of different shapes, V-shaped and W-shaped, are opened on the outer circle of the rotor to improve the air gap magnetic field waveform, reduce motor harmonics, reduce the radial order electromagnetic force of the motor, reduce motor noise, and make the motor have excellent NVH performance.

[0022] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0024] Figure 1 This is a lamination diagram of an existing rotor structure;

[0025] Figure 2 This is a stamping diagram of an embodiment provided by this utility model;

[0026] Figure 3 This is a rotor topology diagram of an embodiment provided by this utility model;

[0027] Figure 4 This is the first V-shaped magnetic steel groove label provided in the embodiment of this utility model. Figure 1 ;

[0028] Figure 5This is the first V-shaped magnetic steel groove label provided in the embodiment of this utility model. Figure 2 ;

[0029] Figure 6 This is the first V-shaped magnetic steel groove label provided in the embodiment of this utility model. Figure 3 ;

[0030] Figure 7 This is the second V-shaped magnetic steel groove label provided in the embodiment of this utility model. Figure 1 ;

[0031] Figure 8 This is the second V-shaped magnetic steel groove label provided in the embodiment of this utility model. Figure 2 ;

[0032] Figure 9 This is a diagram showing the first auxiliary groove on the outer circle of an embodiment provided by this utility model;

[0033] Figure 10 This is an enlarged version of the second auxiliary groove on the outer circle provided in the embodiment of this utility model;

[0034] Figure 11 This is a diagram showing the second auxiliary groove on the outer circle according to an embodiment of this utility model;

[0035] Figure 12 This is the peak torque simulation curve provided by the embodiment of this utility model;

[0036] Figure 13 This is a simulation curve of the rated torque provided in an embodiment of this utility model;

[0037] Figure 14 This is the torque ripple ratio provided in the embodiments of this utility model;

[0038] Figure 15 This is a simulation cloud diagram of the stamping stress provided in an embodiment of this utility model;

[0039] Figure 16 These are the electromagnetic force simulation values ​​provided in the embodiments of this utility model;

[0040] Figure 17 This is an electromagnetic force simulation curve provided by an embodiment of this utility model;

[0041] In the diagram, 1. Rotor lamination body; 2. Shaft hole; 3. First V-shaped magnet slot; 3-1. Inner edge of magnet slot; 3-2. Outer edge of magnet slot; 3-3. First magnetic bridge edge; 3-4. Arc edge; 3-5. Magnetic barrier edge; 3-6. Upper limit; 3-7. Lower limit; 3-8. Lower protrusion; 3-9. Upper protrusion; 4. Second V-shaped magnet slot; 4-1. Inner edge of magnet slot; 4-2. First limit; 4-3. Second magnetic bridge edge; 4-4. Outer edge of magnet slot; 4-5. First protrusion; 4-6. Third magnetic bridge edge; 4-7. Second limit; 5. First auxiliary slot; 6. Second auxiliary slot; 7. Rivet hole; 8. Weight reduction hole; 9. Keyway; 10. Marking slot; A. d-axis; B. q-axis. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 2-17 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0043] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] Reference Figures 2-6 As shown, this utility model provides a permanent magnet motor rotor lamination structure that improves structural strength and NVH (noise, vibration, and harshness). It includes a rotor lamination body 1, on which 2p magnetic poles are provided, and a central shaft hole 2. The dividing line of the magnetic poles is the q-axis B, and the line of symmetry of the magnetic poles is the d-axis A.

[0046] Example 1

[0047] A first V-shaped magnetic steel groove 3, symmetrical about the d-axis, is provided on the magnetic pole. The first V-shaped magnetic steel groove on one side includes an inner edge line 3-1 and an outer edge line 3-2 of the magnetic steel groove that are parallel to each other, a first magnetic isolation bridge edge line 3-3 near the outer circle of the rotor, an arc edge 3-4 near the other single-sided first magnetic steel groove, and a magnetic barrier edge line 3-5 connecting the arc edge and the inner edge line of the magnetic steel groove. It also includes an upper limit position 3-6, a lower limit position 3-7, a lower protrusion 3-8, and an upper protrusion 3-9. The upper limit position is connected between the inner edge line of the magnetic steel groove and the first magnetic isolation bridge edge line, and the lower limit position is connected between the inner edge line of the magnetic steel groove and the magnetic barrier edge line. The upper protrusion is connected between the outer edge line of the magnetic steel groove and the first magnetic isolation bridge edge line, and the lower protrusion is connected between the outer edge line of the magnetic steel groove and the arc edge. The two ends of the magnetic barrier edge line are connected to the arc edge and the lower limit position, respectively.

[0048] The rotor laminations have a diameter φ1 of 140mm to 150mm, a shaft hole diameter φ2 of 40mm to 52mm, and an included angle α1 of 110° to 120° between the two single-sided first V-shaped magnet slots. The minimum distance H2 between the two magnets in the first V-shaped magnet slot is 3.0mm to 4.0mm, and the gap between the magnet and the magnet slot is 0.05mm to 0.1mm to ensure that the magnet can be smoothly inserted into the magnet slot. The two single-sided first V-shaped magnet slots are connected by arc edges to form a magnetic bridge of unequal width, and the minimum width of the unequal width magnetic bridge is H4.

[0049] The first magnetic isolation bridge has a first equal-width magnetic isolation bridge between its side line and the outer circle of the rotor, with a spacing H1 of 0.7mm to 1.0mm. The upper limits are the first side line and the second side line, with the first side line perpendicular to the inner edge of the magnetic slot and a length L1 of 1.0mm to 1.2mm. The included angle α6 between the second side line and the first side line is 75° to 85°, and the ends of the second side line and the first magnetic isolation bridge side line are connected. The lower limits are the third side line and the fourth side line, which are perpendicular to each other. The third side line is perpendicular to the inner edge of the magnetic slot and a length L1 of 1.0mm to 1.2mm. The length W1 of the fourth side line is 1. 0mm~1.4mm; the magnetic barrier edge is divided into a fifth edge and a sixth edge. The angle α2 between the fifth edge and the inner edge of the magnet is 15°~20°. The fifth edge is located on the side of the inner edge of the magnet groove. The angle α3 between the sixth edge and the inner edge of the magnet groove is 15°~20°. The maximum distance L2 between the endpoint of the sixth edge and the inner edge of the magnet groove is 4.0mm~5.0mm. The center of the arc edge is located on the q-axis. The distance H3 between the center and the edge of the shaft hole is 35mm~40mm. The diameter φ3 of the arc edge is 40mm~45mm. The minimum width of the unequal width magnetic bridge is H4. P is the number of pole pairs of the motor; the lower protrusion includes the seventh side, the distance W2 between the starting position of the seventh side and the lower short side of the magnet is 3.5mm to 4.5mm, and the angle α4 between the seventh side and the outer edge of the magnet slot is 145° to 155°; the upper protrusion includes the eighth side, the distance W3 between the starting position of the eighth side and the upper short side of the magnet is 0.5mm to 1.0mm, and the angle α5 between the eighth side and the outer edge of the magnet slot is 160° to 170°.

[0050] The chamfer R1 between the fifth and sixth sides of the magnetic barrier edge is 1.2mm to 1.8mm; the chamfer R2 between the sixth side and the arc edge is 1.5mm to 2.2mm; the chamfer R3 between the lower protrusion and the arc edge is 2.5mm to 4.0mm; the chamfer R4 between the lower protrusion and the outer edge of the magnetic groove is 2.0mm to 4.0mm; the chamfer R5 between the upper protrusion and the outer edge of the magnetic groove is 0.5mm to 1.0mm; the chamfer R6 between the upper protrusion and the edge of the first magnetic isolation bridge is 0.8mm to 1.2mm; the chamfer R7 between the edge of the first magnetic isolation bridge and the upper limit position is 0.8mm to 1.5mm; and the remaining unspecified chamfers are all 0.3mm.

[0051] In this embodiment, firstly, two protrusions are provided on the outer edge of the first V-shaped magnet slot, and the position, angle, and size of the protrusions are optimized; secondly, magnet limiters of different shapes and angles are provided at both ends of the inner edge of the magnet slot; and thirdly, a magnetic isolation bridge with an arc edge and unequal width is provided between the two magnet slots. These three features together optimize the shape of the first V-shaped magnet slot, effectively improving the distribution of the rotor magnetic field and the strength stress of the rotor laminations, thus improving the mechanical performance of the motor during high-speed operation and facilitating high-speed motor operation.

[0052] Example 2

[0053] like Figures 7-8 As shown, based on Embodiment 1, it also includes a second V-shaped magnetic groove 4 that is symmetrical about the d-axis. The second V-shaped magnetic groove includes an inner side line 4-1, a first limit 4-2, a second magnetic bridge side line 4-3, an outer side line 4-4, a first protrusion 4-5, a third magnetic bridge side line 4-6, and a second limit 4-7 that are connected to each other in sequence.

[0054] Among them, the included angle β1 between the two single-sided second V-shaped magnetic steel slots is 145°~160°; the minimum distance h2 between the two magnets in the second V-shaped magnetic steel slot is 2.0mm~2.5mm, and the gap between the magnet and the magnetic steel slot is 0.05mm~0.1mm to ensure that the magnet can be smoothly inserted into the magnetic steel slot; the second magnetic isolation bridge edge line between the two single-sided second V-shaped magnetic steel slots forms a second equal-width magnetic isolation bridge, and the width h3 of the second equal-width magnetic isolation bridge is 0.8mm~1.2mm; the third magnetic isolation bridge edge line and the outer circle of the rotor form a third equal-width magnetic isolation bridge, and the width h1 of the third equal-width magnetic isolation bridge is 0.7mm~1.0mm; the first limit includes a first line segment and a second line segment, the first The line segment is perpendicular to the inner edge of the magnet groove. The length l1 of the first line segment is 0.8mm to 1.2mm, and the included angle β2 between the first and second line segments is 75° to 85°. The second limit includes a third line segment and a fourth line segment. The third line segment is perpendicular to the inner edge of the magnet groove. The length l1 of the third line segment is 0.8mm to 1.2mm, and the included angle β3 between the third and fourth line segments is 95° to 105°. The starting position of the first protrusion is 2.5mm to 3.5mm away from the short side of the magnet. The first protrusion is composed of two continuous chamfers r3 and r4. Chamfer r3 is 0.8mm to 1.0mm, and chamfer r4 is 0.8mm to 1.0mm.

[0055] The chamfer r1 between the first limit and the second magnetic bridge edge is 0.3mm to 0.5mm, the chamfer r2 between the second magnetic bridge edge and the outer edge of the magnetic groove is 0.8mm to 1.2mm, the chamfer r5 between the second limit and the third magnetic bridge edge is 0.8mm to 1.2mm, and the remaining unspecified chamfers are all 0.3mm.

[0056] On the second V-shaped magnet slot, firstly, a protrusion is provided on the outer edge of the magnet slot, and the position, angle, and size of the protrusion are optimized; secondly, magnet limiters of different shapes and angles are provided at both ends of the inner edge of the magnet slot. In conjunction with the shape of the first V-shaped magnet slot, this further improves the distribution of the rotor magnetic field and the strength stress of the rotor laminations, thereby improving the mechanical performance of the motor during high-speed operation and facilitating high-speed motor operation.

[0057] Example 3

[0058] like Figure 9As shown, based on Embodiment 2, two first auxiliary slots 5 are provided symmetrically about the d-axis inside the magnetic pole. The first auxiliary slots have a V-shaped structure and are located on the outer circle of the rotor between the first V-shaped magnet and the second V-shaped magnet. The distance D1 between the lowest point of the first auxiliary slot and the outer circle of the rotor is 0.25mm to 0.5mm. The angle γ1 between the line connecting the lowest point of the first auxiliary slot and the center of the shaft hole and the d-axis is 13.5° to 15.0°. The angle γ2 between the lines connecting the two end points of the first auxiliary slot and the center of the shaft hole and the line connecting the lowest point of the first auxiliary slot and the center of the shaft hole is 0.5° to 1.0°.

[0059] Example 4

[0060] like Figures 10-11 As shown, based on embodiment 2 or 3, two second auxiliary slots 6 are provided symmetrically about the d-axis inside the magnetic pole. The second auxiliary slots have a W-shaped structure and are located on the outer circle of the rotor between the first V-shaped magnet slot and the q-axis. They include a left end point, a first low point, a left middle end point, a right middle end point, a second low point, and a right end point. The distance D2 between the first low point of the second auxiliary slot and the outer circle of the rotor is 0.55mm to 0.5mm, and the distance D3 between the second low point of the second auxiliary slot and the outer circle of the rotor is 0.25mm to 0.4mm.

[0061] The angle δ1 between the line connecting the first lowest point of the second auxiliary groove and the center of the shaft hole and the d-axis is 20°–22°; the angle δ2 between the line connecting the left end point of the second auxiliary groove and the center of the shaft hole and the line connecting the first lowest point of the second auxiliary groove and the center of the shaft hole is 1.0°–1.5°; the angle δ3 between the line connecting the left middle end point of the second auxiliary groove and the center of the shaft hole and the line connecting the first lowest point of the second auxiliary groove and the center of the shaft hole is 0.5°–1.0°. The angle δ4 between the line connecting the second lowest point and the center of the shaft hole and the line connecting the first lowest point and the center of the shaft hole of the second auxiliary groove is 1.0° to 1.5°. The angle between the line connecting the right middle end point of the second auxiliary groove and the center of the shaft hole and the line connecting the second lowest point of the second auxiliary groove and the center of the shaft hole, and the angle between the line connecting the right end point of the second auxiliary groove and the center of the shaft hole and the line connecting the second lowest point of the second auxiliary groove and the center of the shaft hole, are both δ5, which is 0.5° to 1.0°.

[0062] In embodiments 1-4, the rotor laminations also have the same number of rivet holes 7 and large-area weight-reduction holes 8 as the number of motor poles. This facilitates the stacking of rotor laminations and reduces the rotor's moment of inertia, which is beneficial for motor weight reduction and high-speed operation, thus meeting the motor's weight requirements. The rivet holes and weight-reduction holes are both located on the q-axis and are symmetrically arranged about the q-axis.

[0063] In embodiments 1-4, a keyway 9 and a marking groove 10 with an offset angle are provided in the rotor shaft hole, which is beneficial for the axial segmentation of the motor and improves the torque pulsation and NVH performance of the motor.

[0064] This utility model also provides a motor that adopts a permanent magnet motor rotor lamination structure that improves structural strength and NVH as described above.

[0065] An embodiment with rotor laminations including the aforementioned first V-shaped magnet slot, second V-shaped magnet slot, first auxiliary slot, and second auxiliary slot; one is derived from torque pulse simulation analysis, such as... Figures 12-14 The results shown indicate that the percentage of torque ripple in both peak and rated torque, as well as the proportion of their dominant orders, are very small. Secondly, a simulation of the lamination strength is performed, as follows: Figure 15 As shown: the set speed is 17600 rpm, the simulated maximum stress is 306.98 MPa, the yield strength of the used lamination is 445 MPa, and the safety margin is about 1.45, which can meet the mechanical strength requirements of the motor at high speed.

[0066] The simulated radial electromagnetic force densities of the 24th and 48th orders in this scheme are relatively small, resulting in a significant improvement in motor noise. The 24th and 48th orders represent the dominant noise orders of a 48-slot, 8-pole motor. (See below.) Figures 16-17 As shown.

[0067] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A permanent magnet motor rotor lamination structure with improved structural strength and NVH, including a rotor lamination body, on which 2p magnetic poles are provided and a central shaft hole is formed; Its features are: A first V-shaped magnetic steel groove symmetrical about the d-axis is provided on the magnetic pole. The first V-shaped magnetic steel groove on one side includes an inner edge line and an outer edge line of the magnetic steel groove that are parallel to each other, a first magnetic isolation bridge edge line near the outer circle of the rotor, an arc edge near the other first magnetic steel groove on one side, and a magnetic barrier edge line connecting the arc edge and the inner edge line of the magnetic steel groove. It also includes an upper limit position, a lower limit position, a lower protrusion, and an upper protrusion. The upper limit position is connected between the inner edge line of the magnetic steel groove and the first magnetic isolation bridge edge line, and the lower limit position is connected between the inner edge line of the magnetic steel groove and the magnetic barrier edge line. The upper protrusion is connected between the outer edge line of the magnetic steel groove and the first magnetic isolation bridge edge line, and the lower protrusion is connected between the outer edge line of the magnetic steel groove and the arc edge. The two ends of the magnetic barrier edge line are connected to the arc edge and the lower limit position, respectively.

2. The permanent magnet motor rotor lamination structure for improving structural strength and NVH according to claim 1, characterized in that: The diameter φ1 of the rotor lamination is The diameter of the shaft hole φ2 is The included angle α1 between the two single-sided first V-shaped magnet grooves is The minimum spacing H2 between the two magnets in the first V-shaped magnet slot is The gap between the magnet and the magnet slot is This ensures that the magnet can be smoothly inserted into the magnet slot; the two single-sided first V-shaped magnet slots are connected by a magnetic bridge of unequal width formed by the arc edge, and the minimum width of the magnetic bridge of unequal width is H4.

3. The permanent magnet motor rotor lamination structure for improving structural strength and NVH according to claim 1 or 2, characterized in that: The first magnetic isolation bridge edge and the rotor outer circle form the first equal-width magnetic isolation bridge, with a spacing H1 between them. The upper limits are the first sideline and the second sideline, respectively. The first sideline is perpendicular to the inner edge of the magnetic groove, and its length L1 is 1.0mm~1.2mm. The angle α6 between the second sideline and the first sideline is... The second sideline and the first magnetic bridge sideline are connected at their ends; the lower limits are the third and fourth sidelines, which are perpendicular to each other. The third sideline is perpendicular to the inner edge of the magnetic groove, and the length L1 of the third sideline is 1.0mm~1.2mm. The length W1 of the fourth sideline is... The magnetic barrier is divided into a fifth edge and a sixth edge. The angle α2 between the fifth edge and the inner edge of the magnet is... The fifth side is located on the inner side of the magnet groove, and the angle α3 between the sixth side and the parallel direction of the inner side of the magnet groove is... And the maximum distance L2 between the endpoint of the sixth side line and the inner side line of the magnet groove is The center of the arc edge is located on the q-axis, and the distance H3 between the center and the edge of the shaft hole is... The diameter φ3 of the arc edge is The minimum width of the unequal-width magnetic bridge is H4, where P represents the number of pole pairs of the motor; the lower protrusion includes the seventh side, and the distance W2 between the starting position of the seventh side and the lower short side of the magnet is 3.5mm~4.5mm, and the angle α4 between the seventh side and the outer edge of the magnet slot is 145°~155°; the upper protrusion includes the eighth side, and the distance W3 between the starting position of the eighth side and the upper short side of the magnet is... The angle between the eighth side and the outer edge of the magnetic groove is α5. .

4. The permanent magnet motor rotor lamination structure for improving structural strength and NVH according to any one of claims 1-3, characterized in that: It also includes a second V-shaped magnetic steel groove that is symmetrical about the d-axis. The second V-shaped magnetic steel groove includes an inner side line of the magnetic steel groove, a first limit, a second magnetic isolation bridge side line, an outer side line of the magnetic steel groove, a first protrusion, a third magnetic isolation bridge side line, and a second limit, which are connected to each other in sequence.

5. The permanent magnet motor rotor lamination structure for improving structural strength and NVH according to claim 1, characterized in that: The included angle β1 between the two single-sided second V-shaped magnet slots is The minimum distance h2 between the two magnets in the second V-shaped magnet slot is The gap between the magnet and the magnet slot is This ensures that the magnet can be smoothly inserted into the magnet slot; the second magnetic isolation bridge between the two single-sided second V-shaped magnet slots forms a second equal-width magnetic isolation bridge, the width h3 of which is... The third magnetic bridge edge and the rotor outer circle form a third equal-width magnetic bridge, the width h1 of which is... The first limit includes a first line segment and a second line segment. The first line segment is perpendicular to the inner side line of the magnetic groove, and the length l1 of the first line segment is... The angle β2 between the first line segment and the second line segment is The second limit includes a third segment and a fourth segment. The third segment is perpendicular to the inner edge of the magnetic groove, and the length l1 of the third segment is... The angle β3 between the third and fourth line segments is The starting point of the first protrusion is 2.5mm to 3.5mm away from the short side of the magnet. The first protrusion is composed of two consecutive chamfers r3 and r4, with chamfer r3 measuring 0.8mm to 1.0mm and chamfer r4 measuring 0.8mm to 1.0mm.

6. The permanent magnet motor rotor lamination structure for improving structural strength and NVH according to claim 4, characterized in that: Two first auxiliary slots are provided inside the magnetic poles, symmetrically arranged about the d-axis. The first auxiliary slots have a V-shaped structure and are located on the outer circle of the rotor between the first V-shaped magnet and the second V-shaped magnet.

7. The permanent magnet motor rotor lamination structure for improving structural strength and NVH according to claim 4, characterized in that: Two second auxiliary slots are provided inside the magnetic poles, symmetrically arranged about the d-axis. The second auxiliary slots have a W-shaped structure and are located on the outer circle of the rotor between the first V-shaped magnet slot and the q-axis.

8. The permanent magnet motor rotor lamination structure for improving structural strength and NVH according to claim 1, characterized in that: The rotor laminations also have the same number of rivet holes and large-area weight-reduction holes as the number of poles in the motor.

9. The permanent magnet motor rotor lamination structure for improving structural strength and NVH according to claim 1, characterized in that: The rotor shaft hole is provided with a keyway and a marking groove with an offset angle.

10. An electric motor, characterized in that: The permanent magnet motor rotor lamination structure described in any one of claims 1-9 is used to improve structural strength and NVH.

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